Do you have the lens set and locked on its smallest aperture setting (ie 22)? If you are in an automated exposure setting and your lens isn't set thta way, then you'll get the ErrorDo you have the lens set and locked on its smallest aperture setting (ie 22)? If you are in an automated exposure setting and your lens isn't set thta way, then you'll get the Error

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Is this preventing you from shooting?
Normally the r-number simply indicates how many more shots you can take in the current burst before the buffer fills up and the camera has to slow down to save the pictures to the memory card. It's purely FYI and shouldn't stop you from shooting (until it gets down to r00).

The lock that's around the 4-way button that moves the AF point will stop it from moving. The AF switch (says C,S,M) on the body below the lens release button gets knocked to manual and turns off the AF

Hello,The Nikon D90 works well with the Nikon AF 50mm lenses and most other brand Nikon fit AF lenses. If they are not AF you will lose autofocus and metering.Do you know that on the D90 the lens becomes a 75mm but the aperture stays the same, so for instance the 50mm f/1.8 is a 75mm f/1.8.

you cannot see all 51 AF points in the viewfinder. The purpose for this is not to block your view of the actual view. But the AF points are there. Just press the multi selector button to move the AF points around